I get in a muddle and start burning! (6)
I believe the answer is:
ignite
'start burning' is the definition.
(I've seen this in another clue)
'i get in a muddle' is the wordplay.
'a muddle' indicates anagramming the letters.
'get'+'in'='getin'
'getin' anagrammed gives 'gnite'.
'i'+'gnite'='IGNITE'
'and' is the link.
(Other definitions for ignite that I've seen before include "Catch fire; provoke" , "Kindle Fire" , "Cause to catch fire" , "Set fire to, light up" , "Put a match to" .)