Thanks for giving them two fifties - it's higher than average (4)
I believe the answer is:
tall
'average' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'thanks for giving them two fifties it's higher' is the wordplay.
I cannot quite understand how this works, but
'thanks' could be 'ta' (UK informal version of 'thank you') and 'ta' is present in the answer.
'fifties' could be 'll' (the Roman numeral for 50 written twice) and 'll' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'than' is the link.
Can you help me to learn more?
(Other definitions for tall that I've seen before include "Vertically large" , "Above average height" , "Lofty; unlikely" , "Like giants" , "Towering" .)