Section of Halle groans in this direction (7)
I believe the answer is:
allegro
'direction' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'section of halle groans in' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'ALLEGRO' is hidden in the letters of 'halle groans in'.
'this' acts as a link.
Can you help me to learn more?
(Other definitions for allegro that I've seen before include "Quick (of a score)" , "In rapid tempo" , "'Brisk and lively, musically (7)'" , "A fast piece of work" , "(In music) briskly" .)