Warm-hearted love for a sweep, perhaps (3)

I believe the answer is:

oar

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'a sweep perhaps' is the definition.
(sweep is a kind of oar)

'warm-hearted love' is the wordplay.
'warm' becomes 'o' (I can't justify this - if you can you should give a lot more credence to this answer).
'hearted' means to look at the middle letters.
'love' becomes 'endearment'.
The central letters of 'endearment' are 'ar'.
'o'+'ar'='OAR'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for oar that I've seen before include "It ends in blade" , "spoon?" , "I'm involved in row" , "Rowing blade" , "Implement to propel a boat" .)

I've seen this clue in the Evening Standard.

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