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Longman Dictionary of Contemporary English
five-a-side
adjective
COLLOCATIONS FROM OTHER ENTRIES
five-a-side football (=with five players on each team)
▪ His son played in a five-a-side football tournament.
EXAMPLES FROM CORPUS
▪ Cheshire Constabulary youth five-a-side contest is open to teams of seven, including substitutes, from under-10s to under-16s.
▪ From Easter onwards, the area is laid with eight tennis courts and three five-a-side pitches.
▪ He also plays five-a-side soccer three times a week.
▪ Robert is a keen footballer, playing for Stoddard's team in the Paisley and District five-a-side league.
▪ The course includes coaching, training, an Ayresome Park tour, and a five-a-side competition.
▪ There was a little five-a-side league there.
Wiktionary
five-a-side

n. (context soccer English) a variation of soccer played on a smaller pitch, and with only five players in a team.

Wikipedia
Five-A-Side

Five-A-Side is the debut album by the pop rock band Ace, released by Anchor Records in 1974.

The album landed on the Billboard 200 chart, reaching #11 in 1974.

The single " How Long" reached #3 on the Billboard Hot 100. The song also reached #24 on the Adult Contemporary chart, #3 on the Canadian Singles Chart, and #20 on the UK Singles Chart. The song "Rock & Roll Runaway" peaked at #71 on the Billboard Hot 100 in 1975.

The album was recorded at Rockfield Studios near Monmouth in Wales and at Trident Studios in London, England. It was produced by John Anthony.