Be of use (5)

I think it could be either:

serve

avail

'be of use' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for avail that I've seen before include "Make use, take advantage" , "(Of no) use or benefit" , "Provide help; profit" , "Medal (informal)" , "Help, benefit" .)

I've seen this clue in The Guardian, The New York Times, the Evening Standard, the Sydney Morning Herald, the Universal, The Independent, The Mirror, the LA Times, The Telegraph and the King Feature Syndicate.

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