Investigation about burn, achy when uncovered (8)
I believe the answer is:
research
'investigation' is the definition.
(research is investigating something)
'about burn achy when uncovered' is the wordplay.
I cannot really see how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found in the answer.
'burn' could be 'sear' (sear can mean to burn) and 'sear' is found within the answer.
The remaining letters 'ch' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for research that I've seen before include "What may make you a doctor" , "scientific survey" , "Investigation designed to expand knowledge" , "Fact-finding" , "Scientific study" .)