Extensive search for criminal servant locking knight inside dwelling (7)
I believe the answer is:
manhunt
'extensive search' is the definition.
'manhunt' can be an answer for 'search' (manhunt is a kind of search). I'm not sure about the 'extensive' bit.
'criminal servant locking knight inside dwelling' is the wordplay.
I cannot quite understand how this works, but
'servant' could be 'man' (man is a kind of servant) and 'man' is found in the answer.
'knight' could be 'n' (abbreviation for knight in chess) and 'n' is found within the answer.
'dwelling' could be 'hut' (I have seen 'Crude dwelling ' mean 'hut' so perhaps 'dwelling' could also mean 'hut') and 'hut' is present in the leftover letters.
No letters remain.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for manhunt that I've seen before include "Search for wanted person" , "Search for criminal" , "Organised search for a fugitive" , "Police search operation" , "in which one wanted to be found?" .)