Bacon's getting increasingly hot-headed (6)
I believe the answer is:
rasher
'bacon's' is the definition.
(I've seen this before)
'getting increasingly hot-headed' is the wordplay.
'getting' says to put letters next to each other.
'increasingly' becomes 'er' (I can't justify this - if you can you should believe this answer much more).
'hot-headed' becomes 'rash' (I've seen this before).
'er' after 'rash' is 'RASHER'.
Can you help me to learn more?
(Other definitions for rasher that I've seen before include "Thin slice of bacon" , "bit of a pig" , "Less circumspect" , "More foolhardy than a slice of bacon" , "pig, to an extent" .)