Resistance draws on several tricks (5)
I believe the answer is:
ruses
'several tricks' is the definition.
'ruses' can be an answer for 'tricks' (a ruse is a trick or ploy). I am unsure of the 'several' bit.
'resistance draws on' is the wordplay.
'resistance' becomes 'r' (abbreviation in physics and electronics).
'draws on' becomes 'uses' (I've seen this in another clue).
'r'+'uses'='RUSES'
Can you help me to learn more?
(Other definitions for ruses that I've seen before include "Clever strategems or plans" , "'Stratagems, tricks (5)'" , "Clever stratagems" , "Stratagem designed to deceive" , "Dodges" .)