See the figure entered is small (6)
I believe the answer is:
slight
'small' is the definition.
(I've seen this before)
'see the figure entered' 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 found in the answer.
'figure' could be 'l' (I've seen this in other clues) and 'l' is present in the answer.
The remaining letters 'sigh' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for slight that I've seen before include "Insult - not important!" , "Minor -- snub" , "Slim or tenuous" , "Small in degree; insult" , "slap in the face" .)