To love excessively (3)

I believe the answer is:

too

'excessively' is the definition.
(to too great a degree)

'to love' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'to'+'o'='TOO'

(Other definitions for too that I've seen before include "Additionally" , "On top - also" , "Excessively" , "To a greater than desirable extent" , "Furthermore" .)

I've seen this clue in the Evening Standard.

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