Right leg, bit above it (4,2)
I believe the answer is:
spot on
'right' is the definition.
(I've seen this before)
'leg bit above it' is the wordplay.
I cannot quite see how this works, but
'leg' could be 'on' (cricket term, fielding positions) and 'on' is present in the answer.
'bit' could be 'o' (resembles 0, a binary digit or bit) and 'o' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for spot on that I've seen before include "Absolutely right" , "what soiled garment had?" , "What the leading actor may have" , "Completely accurate" , "Excellent" .)