Calm current provided in photo (7)
I believe the answer is:
pacific
'calm' is the definition.
(I've seen this before)
'current provided in photo' is the wordplay.
'current' becomes 'ac' (alternating current).
'provided' becomes 'if' (eg 'provided it's sunny' means 'if it's sunny').
'in' is an insertion indicator.
'photo' becomes 'pic' (short for picture).
'ac'+'if'='acif'
'acif' placed inside 'pic' is 'PACIFIC'.
(Other definitions for pacific that I've seen before include "Conciliatory - calm" , "Non-combative" , "Main" , "Peaceful in character" , "water" .)