Complaint I will put before the Head (7)
I believe the answer is:
illness
'complaint' is the definition.
(illness is a kind of health problem)
'i will put before the head' is the wordplay.
'i will' becomes 'I'll' (abbreviation).
'put before' is a charade indicator (letters next to each other).
'the head' becomes 'ness' (ness is a headland).
'ill'+'ness'='ILLNESS'
(Other definitions for illness that I've seen before include "suffering this" , "Sick condition" , "Malady, sickness" , "Period of sickness" , "Upset" .)