Send away to the ultimate seaside haven? (6)
I believe the answer is:
deport
'send away' is the definition.
(thesaurus)
'the ultimate seaside haven?' is the wordplay.
'the ultimate seaside' becomes 'de' (I can't justify this - if you can you should give a lot more credence to this answer).
'haven?' becomes 'port' (haven is a kind of port).
'de'+'port'='DEPORT'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for deport that I've seen before include "Exile" , "Expel from country - not a citizen" , "Banish (undesirable alien?)" , "Expel as an undesirable alien" , "Send away, being de trop" .)