Introduce character providing opening for somewhat lifeless hosts (6)
I believe the answer is:
insert
'introduce character' is the definition.
'insert' can be an answer for 'introduce' ('insert' can be a synonym of 'introduce'). I'm unsure of the 'character' bit.
'opening for somewhat lifeless hosts' is the wordplay.
'opening for' indicates taking the first letters.
'lifeless' becomes 'inert' (I've seen this before).
'hosts' means one lot of letters goes inside another.
The first letter of 'somewhat' is 's'.
's' going inside 'inert' is 'INSERT'.
'providing' is the link.
Can you help me to learn more?
(Other definitions for insert that I've seen before include "Add in" , "Put in; enclosure" , "Enclose" , "Loose ad in magazine" , "Put something inside something else" .)