Frequently love loud note (5)
I believe the answer is:
often
'frequently' is the definition.
(synonyms)
'love loud note' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'loud' becomes 'f' (short for forte - 'loud' in music).
'note' becomes 'ten' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'f'+'ten'='OFTEN'
Can you help me to learn more?
(Other definitions for often that I've seen before include "Frequently, many times" , "A great deal" , "on numerous occasions" , "Regularly" , "Quite frequently" .)