Herb attaches weapon to a bomb (9)

I believe the answer is:

spearmint

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

'herb' is the definition.
(I know that spearmint is a type of herb)

'weapon to a bomb' is the wordplay.
'weapon' becomes 'spear' (spear is a kind of weapon).
'to a bomb' becomes 'mint' (I've seen this before).
'spear'+'mint'='SPEARMINT'

'attaches' is the link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for spearmint that I've seen before include "Garden flavouring" , "Aromatic herb" , "Strongly flavoured herb" , "Herb used for flavouring" , "Aromatic plant" .)

I've seen this clue in The Telegraph.

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