Transport for pair (sea otter and wife) swimming together (9)
I believe the answer is:
twoseater
'otter and wife swimming together' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'transport for pair sea' is the wordplay.
'transport' becomes 'ter' (I can't explain this - if you can you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'pair' becomes 'two' (a pair means two of something).
'two'+'sea'='twosea'
'ter' put after 'twosea' is 'TWOSEATER'.
Can you help me to learn more?
(Another definition for twoseater that I've seen is " car, perhaps".)