Being firm, refuse starter in delicatessen seeing fan is affected by intestinal disorder (7)
I believe the answer is:
coeliac
'affected by intestinal disorder' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can occasionally define each other.
'being firm refuse starter in delicatessen seeing fan' is the wordplay.
I cannot really understand how this works, but
'firm' could be 'co' (a firm is a company) and 'co' is present in the answer.
'starter' could be 'l' (as in a learner driver with L-plates on their car) and 'l' is present in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for coeliac that I've seen before include "of the belly" , "Relating to the abdomen - ice cola (anag)" .)