Worm catcher, one up at cockcrow? (5,4)
I believe the answer is:
early bird
I believe this is a double definition.
'worm catcher' is the first definition.
(as in the phrase 'the early bird catches the worm')
'one up at cockcrow?' is the second definition.
(somebody who gets up early)
(Other definitions for early bird that I've seen before include "One up with the lark" , "arrived before time" , "one up at dawn" , "Chorus singer" , "one in good time for breakfast" .)