Uniform’s for the Girl Guides (6)
I believe the answer is:
ushers
'guides' is the definition.
(I know this)
'uniform's for the girl' is the wordplay.
'uniform's' becomes 'U's' (phonetic alphabet: alpha, bravo, charlie etc.).
'for' means one lot of letters go next to another.
'the girl' becomes 'hers' (I can't justify this - if you can you should believe this answer much more).
'us'+'hers'='USHERS'
Can you help me to learn more?
(Other definitions for ushers that I've seen before include "Rushes with conductors" , "They show you to your seat" , "They show attendees to seats" , "Guides" , "They show people to their seats in theatres" .)