Continually complain in the rain again (3)
I believe the answer is:
nag
'continually complain' is the definition.
'nag' can be an answer for 'complain' (nagging is a kind of complaining). I'm not certain of the 'continually' bit.
'in the rain again' is the wordplay.
'in' indicates the answer is hidden within the clue.
'NAG' can be found hidden inside 'rain again'.
Can you help me to learn more?
(Other definitions for nag that I've seen before include "Pester; old horse" , "Bother persistently" , "Worry; old horse" , "Hack" , "Keep criticising, hurting" .)