Unit of measurement for musical time, perhaps? (5)
I believe the answer is:
metre
'unit' is the definition.
(unit of distance)
'measurement for musical time perhaps?' is the wordplay.
'measurement' becomes 'M' (M is an example).
'for' means one lot of letters go next to another.
'musical time perhaps?' becomes 'etre' (I am not sure about this - if you are sure you should believe this answer much more).
'm'+'etre'='METRE'
'of' is the link.
Can you help me to learn more?
(Other definitions for metre that I've seen before include "Alignment of feet determines such" , "Approximately 39 inches" , "39.37 inches" , "Beat pattern (mus.)" , "Rhythmic arrangement of syllables in verse" .)