Good old fashion designer, stimulating (7)
I believe the answer is:
piquant
'stimulating' is the definition.
(similar in meaning)
'good old fashion designer' is the wordplay.
I cannot really see how this works, but
'good' could be 'pi' (old-fashioned term for pious) and 'pi' is present in the answer.
'fashion designer' could be 'quant' (I've seen this before) and 'quant' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for piquant that I've seen before include "Having a pungent taste" , "Pleasantly sharp in taste" , "Flavoursome" , "Pleasantly pungent, stimulating" , "Appetising, tangy" .)