Watchers finding nothing acceptable among hooligans (8)
I believe the answer is:
lookouts
'watchers' is the definition.
(I know this)
'nothing acceptable among hooligans' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'acceptable' becomes 'OK' (OK can mean acceptable or fine).
'among' means one lot of letters goes inside another.
'hooligans' becomes 'louts' (I've seen this in another clue).
'o'+'ok'='ook'
'ook' put within 'louts' is 'LOOKOUTS'.
'finding' is the link.
(Other definitions for lookouts that I've seen before include "They keep watch for someone or something expected" , "Sentries, watchmen" .)