At the seaside, professional men get some strange ideas (9)
I believe the answer is:
promenade
'get some strange ideas' is the definition.
I can't tell whether this defines the answer.
'at the seaside professional men' is the wordplay.
'at' says to put letters next to each other.
'the seaside' becomes 'ade' (I am not sure about this - if you are sure you should believe this answer much more).
'professional' becomes 'pro' (abbreviation).
'pro'+'men'='promen'
'ade' put after 'promen' is 'PROMENADE'.
Can you help me to learn more?
(Other definitions for promenade that I've seen before include "Seaside walk?" , "Seafront walk" , "Place for strolling by the sea" , "Seafront walkway" , "dance" .)