Fire in one holiday cottage accommodating any number (6)
I believe the answer is:
ignite
'fire' is the definition.
(thesaurus)
'one holiday cottage accommodating any number' is the wordplay.
'one' becomes 'i' (Roman numeral).
'holiday cottage' becomes 'gite' (type of holiday house in French).
'accommodating' is an insertion indicator.
'any number' becomes 'n' (I've seen this in other clues).
'gite' placed around 'n' is 'gnite'.
'i'+'gnite'='IGNITE'
'in' is the link.
(Other definitions for ignite that I've seen before include "Catch fire; provoke" , "Touch off; inflame" , "Cause to catch fire" , "Swan constellation" , "Set fire to, light up" .)