Sillier neckwear required in turnout? (7)
I believe the answer is:
nuttier
'sillier' is the definition.
Both the answer and definition are comparative adjectives. Perhaps they are linked in a way I don't understand?
'neckwear required in turnout?' is the wordplay.
I cannot quite see how this works, but
'neckwear' could be 'tie' (type of neckwear) and 'tie' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for nuttier that I've seen before include "Increasingly unbalanced" , "That's not so sensible" .)