Brilliant device and line in Love Story (5,6)

I believe the answer is:

roman candle

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

'brilliant device' is the definition.
'Roman candle' can be an answer for 'device' (Roman candle is an example). I'm not certain of the 'brilliant' bit.

'and line in love story' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' is an insertion indicator.
'love story' becomes 'romance' (synonyms).
'and'+'l'='andl'
'andl' going into 'romance' is 'ROMAN CANDLE'.

Can you help me to learn more?

(Other definitions for roman candle that I've seen before include "Example of fireworks" , "A cold manner (anag) -- firework" , "Type of firework" , "Firework projecting succession of coloured stars" , "Cylindrical firework" .)

I've seen this clue in The Times.

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