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'm unsure of the rest of the definition.
'in crosswords' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SWORD' is hidden within '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" .)