Charlie given drink preferred muffin (7)
I believe the answer is:
'muffin' is the definition.
(I've seen this before)
'charlie given drink preferred' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'given' says to put letters next to each other.
'drink' becomes 'rum' (rum is a kind of drink).
'preferred' becomes 'pet' (synonyms).
(Other definitions for crumpet that I've seen before include "Thick soft cake eaten toasted and buttered", "Thick soft cake with a porous texture", "Thick flat cake, eaten toasted", "Cake usually eaten hot with butter", "Breakfast".)