Crossword Genius

Plant of the mustard family shock alien? (6)

Ross

I believe the answer is:

rocket

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

'plant of the mustard' is the definition.
'rocket' can be an answer for 'plant' (rocket is a kind of plant). I'm not sure about the 'of the mustard' bit.

'family shock alien?' is the wordplay.
'family shock' becomes 'rock' (I can't justify this - if you can you should give a lot more credence to this answer).
'alien?' becomes 'et' (extra terrestrial).
'rock'+'et'='ROCKET'

Can you help me to learn more?

(Other definitions for rocket that I've seen before include "Projectile salad ingredient" , "Salad leaves - move at great speed" , "Salad plant; strong reprimand" , "that should take off?" , "Self-propelled missile and a plant" .)

I've seen this clue in the Sydney Morning Herald.
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