Touching one's left hand restricts pleasure (6)
I believe the answer is:
relish
'pleasure' is the definition.
(I know that relish is a type of enjoyment)
'touching one's left hand restricts' is the wordplay.
I cannot quite understand how this works, but
'touching' could be 're' (both can mean concerning or relating to) and 're' is found in the answer.
'one's' could be 'is' (Roman numeral) and 'is' is present in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found in the answer.
A single letter 'h' remains 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 relish that I've seen before include "Enjoy greatly - such sauce!" , "appetizer?" , "Pleasure - dressing" , "'Take pleasure in, savour (6)'" , "Gusto" .)