Put the tennis ball in play (5)

I think it could be either:

Which length description are you looking for?:

served

'put the tennis ball in play' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for served that I've seen before include "Struck opening ball in tennis game" , "Waited upon" , "Started a game of tennis" , "Dished up" , "Versed (anag)" .)

I've seen this clue in The Irish Times.

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