The French tennis great ultimately squanders lead more than once (7)
I believe the answer is:
leashes
'lead more than once' is the definition.
I can't judge whether this definition defines the answer.
'the french tennis great ultimately squanders' is the wordplay.
'the french' becomes 'le' ('the' in French).
'tennis great' becomes 'ashe' (I've seen this in another clue).
'ultimately' suggests the final letters.
The last letter of 'squanders' is 's'.
'le'+'ashe'+'s'='LEASHES'
Can you help me to learn more?
(Other definitions for leashes that I've seen before include "Restraints for animals" , "Animal controls" .)