He takes charge temporarily for example in a gap (6)
I believe the answer is:
regent
'he takes charge temporarily' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'example in a gap' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'in' means one lot of letters goes inside another.
'a gap' becomes 'rent' (rent is a kind of gap).
'eg' put inside 'rent' is 'REGENT'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for regent that I've seen before include "being temporarily in charge" , "Stand-in ruler" , "Person who rules for a sovereign" , "Replacement ruler" , "Ruler in the absence of a monarch" .)