Too much womaniser of course ultimately breaking hearts, say? (7)
I believe the answer is:
surfeit
'too much' is the definition.
'womaniser of course ultimately breaking hearts say?' is the wordplay.
'ultimately' indicates one should take the final letters.
'breaking' means one lot of letters goes inside another.
'hearts say?' becomes 'suit' (I can't justify this - if you can you should give a lot more credence to this answer).
The last letters of 'womaniser of course' are 'rfe'.
'rfe' placed into 'suit' is 'SURFEIT'.
Can you help me to learn more?
(Other definitions for surfeit that I've seen before include "Overindulgence" , "Superabundance" , "excessive amount" , "stuff, once" , "having had quite enough" .)