Spark from one new barrier after it's lifted (9)
I believe the answer is:
instigate
'spark' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how they can define each other.
'from one new barrier after it's lifted' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'barrier' could be 'gate' (gate is a kind of barrier) and 'gate' is found in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for instigate that I've seen before include "Urge on - teasing it (anag)" , "Bring about, initiate" , "Incite - set in motion" , "Urge and bring about" , "Bring about by incitement - its eating (anag)" .)