This weapon is always found in crosswords (5)
I believe the answer is:
sword
'this weapon is always' is the definition.
'sword' can be an answer for 'weapon' (sword is a kind of weapon). I am unsure of the remainder of the definition.
'in crosswords' is the wordplay.
'in' says the answer is hidden in the clue.
'SWORD' is hidden in the letters of 'crosswords'.
'found' is the link.
Can you help me to learn more?
(Other definitions for sword that I've seen before include "Fencer's weapon" , "Command; social class" , "Brand" , "Cutting weapon" , "Two-edged weapon" .)