Light indefinite number in current French holiday home (6)
I believe the answer is:
ignite
'light' is the definition.
(I've seen this before)
'indefinite number in current french holiday home' is the wordplay.
'indefinite number' becomes 'n' (I've seen this in other clues).
'in' indicates putting letters inside.
'current' becomes 'i' (symbol for electric current).
'french holiday home' becomes 'gite' (I've seen this before).
'i'+'gite'='igite'
'n' going into 'igite' is 'IGNITE'.
(Other definitions for ignite that I've seen before include "Swan constellation" , "Burn" , "Cause to start burning" , "Spark off" , "Torch" .)