Prohibit Oswald going in for whalebone? (6)
I believe the answer is:
baleen
'whalebone?' is the definition.
(synonyms)
'prohibit oswald going in' is the wordplay.
'prohibit' becomes 'ban' (banning is a kind of prohibiting).
'oswald going' becomes 'lee' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'ban' enclosing 'lee' is 'BALEEN'.
'for' is the link.
Can you help me to learn more?
(Another definition for baleen that I've seen is " Enable (anag) - whalebone".)