He can come clean (5)
I believe the answer is:
lance
'he' is the definition.
'come clean' is the wordplay.
'clean' anagrams to 'LANCE'.
However, I'm not sure how the anagram is indicated.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for lance that I've seen before include "Horseman's long weapon" , "steel" , "Weapon of knights of old" , "Cut open" , "Long-shafted weapon" .)