Troubling Dan, leg that's not straight (6)
I believe the answer is:
angled
'that's not straight' is the definition.
(I've seen this in another clue)
'troubling dan leg' is the wordplay.
'troubling' indicates an anagram (letters damaged or in trouble).
'dan'+'leg'='danleg'
'danleg' is an anagram of 'ANGLED'.
(Other definitions for angled that I've seen before include "Glenda (anag.)" , "Cornered" , "Crooked; biased" , "Fished with hook and bait" , "Went fishing" .)