Crossword Genius

Dock stalk on plant (9)

Ross

I believe the answer is:

penstemon

'plant' is the definition.

'dock stalk on' is the wordplay.
'dock' becomes 'pen' (I've seen this in other clues).
'stalk' becomes 'stem' (synonyms).
'pen'+'stem'+'on'='PENSTEMON'

(Other definitions for penstemon that I've seen before include "Step on men, strangely, to get to the flower" , "plant" , "showy flower" .)

I've seen this clue in The Telegraph.
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