It’s all eyes on this popinjay! (7)
I believe the answer is:
peacock
'it's all eyes on this popinjay' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'it's all eyes on this popinjay' is the wordplay.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'all' becomes 'each' (similar in meaning).
'eyes' says to take the centre (I've seen 'eye' mean this (eye can mean the centre of something)).
'on' is an insertion indicator.
'this popinjay' becomes 'pock' (I can't explain this - if you can you should give a lot more credence to this answer).
The centre of 'each' is 'ac'.
'e'+'ac'='eac'
'eac' placed within 'pock' is 'PEACOCK'.
Can you help me to learn more?
(Other definitions for peacock that I've seen before include "Gaudy bird" , "Showy fowl" , "Male bird" , "Ornamental fowl" , "Show-off" .)