Bore and nincompoop you heard at the seaside? (7)
I believe the answer is:
assumed
'bore' is the definition.
(assume can mean to bear or take on)
'nincompoop you heard at the seaside?' is the wordplay.
'nincompoop' becomes 'ass' (I've seen this in another clue).
'you heard' becomes 'U' (homophone of 'you').
'at' is a charade indicator (letters next to each other).
'the seaside?' becomes 'med' (I can't justify this - if you can you should give a lot more credence to this answer).
'ass'+'u'+'med'='ASSUMED'
'and' is the link.
Can you help me to learn more?
(Other definitions for assumed that I've seen before include "Bogus" , "Affected; supposed" , "Taken for granted - feigned" , "Took (responsibility)" , "Surmised" .)