Herb left cap up here (4)

I believe the answer is:

dill

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

'left cap up here' is the wordplay.
'left' says the letters should be written in reverse.
'cap' becomes 'lid' (eg the lid of a bottle).
'up here' becomes 'l' (I can't explain this - if you can you should believe this answer much more).
'lid' reversed gives 'dil'.
'dil'+'l'='DILL'

Can you help me to learn more?

(Other definitions for dill that I've seen before include "Aromatic herb used as seasoning" , "Herb used in pickles" , "Pickling herb" , "Herb with feathery leaves and spicy seeds" , "Medicinal herb" .)

I've seen this clue in The Irish Times.

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