All one's ability to get the right rhyme (5)
I believe the answer is:
might
'all one's ability' is the definition.
'might' can be an answer for 'ability' (thesaurus). I am not certain of the 'all one's' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for might that I've seen before include "It expresses possibility" , "Powerfulness" , "Doubtful" , "- - and main" , "May, in the past" .)