British landsman renders whale fat (7)

I believe the answer is:

blubber

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'whale fat' is the definition.
(I've seen this before)

'british landsman' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in BBC).
'landsman' becomes 'lubber' (synonyms).
'b'+'lubber'='BLUBBER'

'renders' acts as a link.
This may not be correct. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for blubber that I've seen before include "Cry -- whale fat" , "Fatty tissue of a whale" , "Insulating fat" , "Sob loudly" , "Cry uncontrollably" .)

I've seen this clue in The Mirror.

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