Any number were ill and had a seizure? (6)
I believe the answer is:
nailed
'had a seizure?' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Maybe there's a link between them I don't understand?
'any number were ill' is the wordplay.
'any number' becomes 'n' (mathematical symbol for an unspecified number).
'were ill' becomes 'ailed' ('ail' can be a synonym of 'be ill').
'n'+'ailed'='NAILED'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for nailed that I've seen before include "Daniel (anag.)" , "Fastened securely with a pointed piece of metal" , "Firmly fixed" , "Accomplished" , "Fastened with metal pin" .)