Perhaps cap equipment for fossil fuel extraction? (8)
I believe the answer is:
headgear
'perhaps cap' is the definition.
(I know that cap is a type of headgear)
'equipment for fossil fuel extraction?' is the wordplay.
I cannot really see how this works, but
'equipment' could be 'gear' (gear is a kind of equipment) and 'gear' is found in the answer.
The remaining letters 'head' 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 headgear that I've seen before include "which sits on top of mine?" , "Balmoral, perhaps" , "crown, say" , "Mortarboard < , especially" , "Perhaps a hat" .)