Regret guys entering clean centre to make cheese (7)
I believe the answer is:
gruyere
'cheese' is the definition.
(Gruyere is an example)
'regret guys entering clean centre' is the wordplay.
I cannot really see how this works, but
'entering' could be 're' (I've seen this in other clues) and 're' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'to make' acts as a link.
Can you help me to learn more?
(Other definitions for gruyere that I've seen before include "Whole-milk Swiss cheese" , "Tangy cheese" , "Hard yellow Swiss cheese" , "Firm pale cheese with holes" , "Firm Swiss cheese" .)