Crossword Genius

Surprise attack putting pressure on lightweight (6)

Ross

I believe the answer is:

pounce

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

'surprise attack' is the definition.
'pounce' can be an answer for 'attack' (I've seen this before). I am not certain of the 'surprise' bit.

'pressure on lightweight' is the wordplay.
'pressure' becomes 'p' (scientific abbreviation).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'lightweight' becomes 'ounce' (light unit of weight).
'p'+'ounce'='POUNCE'

'putting' is the link.

Can you help me to learn more?

(Other definitions for pounce that I've seen before include "Swoop down suddenly" , "Jump or spring down as on prey" , "Spring to catch" , "Spring (on prey like a cat)" , "Act fast to take advantage" .)

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