Force girl to keep one tipsy (7)
I believe the answer is:
militia
'force girl' is the definition.
'militia' can be an answer for 'force' (I've seen this before). I am unsure of the 'girl' bit.
'to keep one tipsy' is the wordplay.
'to' becomes 'mia' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'keep' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'tipsy' becomes 'lit' (I've seen this in another clue).
'i'+'lit'='ilit'
'mia' placed around 'ilit' is 'MILITIA'.
Can you help me to learn more?
(Other definitions for militia that I've seen before include "Body of citizen soldiers" , "Armed body" , "Band of civilian soldiers" , "Civilian soldier force" , "Army of non-professional soldiers" .)