Irregular discoloration left within clumsy work (6)
I believe the answer is:
blotch
'irregular discoloration' is the definition.
(I've seen this before)
'left within clumsy work' is the wordplay.
I cannot really see how this works, but
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
The remaining letters 'botch' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for blotch that I've seen before include "Unsightly patch" , "Irregular patch or mark" , "Large stain" , "Irregularly shaped spot" , "Spot of irregular discoloration" .)