Peaceful? Turning better if I start to complain (7)
I believe the answer is:
pacific
'peaceful?' is the definition.
('pacific' can be similar in meaning to 'peaceful')
'turning better if i start to complain' is the wordplay.
'turning' is a reversal indicator.
'better' becomes 'cap' (I've seen this before**).
'start to' says to take the initial letters.
The first letter of 'complain' is 'c'.
'cap' back-to-front is 'pac'.
'pac'+'if'+'i'+'c'='PACIFIC'
(Other definitions for pacific that I've seen before include "Peaceable" , "Calm - sea" , "Main" , "Conciliatory - calm" , "Non-combative" .)