Lancer told to choose an entrance (7)

I believe the answer is:

picador

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

'told to choose an entrance' is the wordplay.
'told' indicates a 'sounds like' (homophone) clue.
'to choose' becomes 'pick' (picking is a kind of choosing).
'an' becomes 'a'.
'entrance' becomes 'dor' (I can't explain this - if you can you should give a lot more credence to this answer).
'pick' sounds like 'pic'.
'pic'+'a'+'dor'='PICADOR'

Can you help me to learn more?

(Other definitions for picador that I've seen before include "fighter with lance" , "Riding bullfighter" , "Animal killer" , "The bullfighter who goads the animal" , "ringfighter" .)

I've seen this clue in The Guardian.

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