Gosh, key-holes - two of them! (3)
I believe the answer is:
coo
'gosh' is the definition.
'key-holes two of them' is the wordplay.
I cannot quite see how this works, but
'key' could be 'c' (musical key) and 'c' is present in the answer.
'holes' could be 'oo' (two O's - O looks like a hole) and 'oo' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for coo that I've seen before include "(Of pigeon) murmur" , "Pigeon call" , "Soft sound of dove or baby" , "well I never!" , "Murmur lovingly" .)