Old ink in edited photo is matter of controversy (3,6)
I believe the answer is:
hot potato
'matter of controversy' is the definition.
'hot potato' can be an answer for 'controversy' (I've seen this before). I am not sure about the 'matter of' bit.
'old ink in edited photo' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'ink' becomes 'tat' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'edited' is an anagram indicator.
'o'+'tat'='otat'
'photo' is an anagram of 'hotpo'.
'otat' placed inside 'hotpo' is 'HOT POTATO'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for hot potato that I've seen before include "Awkward thing" , "Burning issue" , "Troublesome situation concerning thermal spud" , "An awkward subject" , "controversial question" .)