Dismiss lovely explosive device

I believe the answer is:

firecracker

I'm a little stuck... Click here to teach me more about this clue!

'explosive device' is the definition.
(firecracker is a kind of explosive device)

'dismiss lovely' is the wordplay.
'dismiss' becomes 'fire' ('fire' can be a synonym of 'dismiss').
'lovely' becomes 'cracker' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'fire'+'cracker'='FIRECRACKER'

Can you help me to learn more?

(Another definition for firecracker that I've seen is " banger".)

I've seen this clue in The Telegraph.

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