Long bug, thin leaf (4,6)

I believe the answer is:

pine needle

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

'leaf' is the definition.
(I've seen this before)

'long bug thin' is the wordplay.
'long' becomes 'pine' (to pine for someone is to long for them).
'bug thin' becomes 'needle' (annoy. I am not sure about the 'thin' bit.).
'pine'+'needle'='PINE-NEEDLE'

Can you help me to learn more?

(Other definitions for pine needle that I've seen before include "Conifer's leaf" , "Conifer leaf" .)

I've seen this clue in The Independent.

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