See it’s unbeatable when you back it (4)
I believe the answer is:
spot
'see' is the definition.
(thesaurus)
'you back it' is the wordplay.
'you' becomes 'ops' (I can't explain this - if you can you should believe this answer much more).
'back' says the letters should be written in reverse.
'it' becomes 't' (abbreviation. e.g. in 'tis).
'ops' written backwards gives 'spo'.
'spo'+'t'='SPOT'
'it's unbeatable when' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for spot that I've seen before include "[NIGHTCLUB]" , "See 5" , "See - speckle" , "See; pimple" , "Difficult situation" .)