The fool came outside, having dressed (7)
I believe the answer is:
clothed
'dressed' is the definition.
(similar in meaning)
'the fool came outside' is the wordplay.
'the fool' becomes 'clot' (I've seen this before).
'came outside' becomes 'hed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'clot'+'hed'='CLOTHED'
'having' acts as a link.
Can you help me to learn more?
(Other definitions for clothed that I've seen before include "Dressed" , "Attired" , "Clad" , "Wearing attire" , "Wrapped" .)