Sir, I come back with something in my eye! (4)
I believe the answer is:
iris
'eye' is the definition.
(thesaurus)
'sir i come back' is the wordplay.
'come back' shows that the letters should be reversed in order.
'sir'+'i'='siri'
'siri' backwards is 'IRIS'.
'with something in my' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for iris that I've seen before include "- - Murdoch, novelist" , "Lily" , "Female" , "bit of mince pie" , "Flower and eye membrane" .)