Keep man here temporarily (3,3,7)
I believe the answer is:
for the present
'temporarily' is the definition.
(I've seen this before)
'keep man here' is the wordplay.
'keep' becomes 'fort' (I've seen this before).
'man' becomes 'he'.
'here' becomes 'present' ('present' can be similar in meaning to 'here').
'fort'+'he'+'present'='FOR THE PRESENT'
(Other definitions for for the present that I've seen before include "Extract from thank you letter" , "Temporarily" .)