Surprise attack putting pressure on lightweight (6)
I believe the answer is:
pounce
'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" .)