Take action, noting cat on the right is fat (4)
I believe the answer is:
suet
'is fat' is the definition.
(I've seen this before)
'take action noting cat on the right' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'take action' could be 'sue' (as in suing somebody in court) and 'sue' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for suet that I've seen before include "Hard animal fat used in cooking" , "Hard fat in cattle and sheep" , "Fat used in foods" , "Edible animal fat" , "Hard white cooking fat" .)