Health farm regulates pasta? No thanks! (3)
I believe the answer is:
spa
'health farm' is the definition.
(I've seen this in another clue)
'regulates pasta? no thanks' is the wordplay.
'regulates' is an anagram indicator (I've seen 'regulated' mean this).
'no' is a deletion indicator.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'pasta' with 'ta' taken out is 'pas'.
'pas' is an anagram of 'SPA'.
(Other definitions for spa that I've seen before include "Health resort at a mineral spring" , "Healthy place" , "E.g. Harrogate" , "health centre" , "Watering place" .)