Continued deliberate backtracking inflamed hosts (7)
I believe the answer is:
resumed
'continued' is the definition.
(resuming is a kind of continuing)
'deliberate backtracking inflamed hosts' is the wordplay.
'deliberate' becomes 'muse' (I've seen this in another clue).
'backtracking' says the letters should be written in reverse.
'inflamed' becomes 'red' (synonyms).
'hosts' means one lot of letters goes inside another (inserted letters are welcomed or hosted).
'muse' back-to-front is 'esum'.
'esum' inserted into 'red' is 'RESUMED'.
(Other definitions for resumed that I've seen before include "Began again" , "Started again where one had left off" , "Took up again" , "Continued after a pause" , "came into play again" .)