Here Rosie crush got Lee excited — one love lost (15)
I believe the answer is:
gloucestershire
'here rosie crush got lee excited' is the definition.
The definition suggests a singular noun which matches the answer.
'one love lost' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'love' could be 'o' (love means zero in tennis) and 'o' is found within the answer.
'lost' could be 'l' (abbreviation in sporting league tables) and 'l' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for gloucestershire that I've seen before include "area around Cheltenham" , "Potter's tailor had it round" , "English county" .)