Able to stretch to it and he will have fifty over (5)
I believe the answer is:
lithe
'will have fifty over' is the definition.
I can't tell whether this definition defines the answer.
'able to stretch to it and he' is the wordplay.
'able to stretch' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'l'+'it'+'he'='LITHE'
Can you help me to learn more?
(Other definitions for lithe that I've seen before include "Loose-limbed" , "Able to move and bend gracefully" , "Supple and graceful" , "Of body, flexible and supple" , "Don -, opera by Verdi" .)