People waiting in line for a letter, we hear (5)
I believe the answer is:
queue
'people waiting in line' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how one could define the other.
'letter we hear' is the wordplay.
'letter' becomes 'cue' (I've seen this in another clue).
'we hear' indicates a 'sounds like' (homophone) clue.
'cue' sounds like 'QUEUE'.
'for a' acts as a link.
Can you help me to learn more?
(Other definitions for queue that I've seen before include "Stand in line" , "(Usually) orderly line" , "Pigtail; get in line" , "Very British assembly" , "Row of waiting people" .)