How cavalry may volunteer their free time? (4,2,6)
I believe the answer is:
make no charge
'how cavalry may volunteer' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'free time?' is the wordplay.
'free' becomes 'make free' (synonyms).
'time?' becomes 'nocharge' (I am not sure about this - if you are sure you should believe this answer much more).
'make'+'nocharge'='MAKE NO CHARGE'
'their' acts as a link.
Can you help me to learn more?
I've seen this clue in The Globe and Mail.
Want a hint initially instead of a full solution?
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