Actively rub some sticks so as to come into flame (5)
I believe the answer is:
burst
'flame' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'actively rub some sticks so as to come' is the wordplay.
I cannot really understand how this works, but
an anagram of 'rub' is 'bur' which is present in the answer.
The remaining letters 'st' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'into' is the link.
Can you help me to learn more?
(Other definitions for burst that I've seen before include "Explode (as 1 acrosses do)" , "Explosion" , "Ruptured" , "Exploded" , "Crack" .)