Ruffian has odd bits of those crags uncovered (6)

I believe the answer is:
toerag
'ruffian' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'odd bits of those crags uncovered' is the wordplay.
'odd bits of' indicates alternate letters.
'uncovered' says to take the centre.
The middle letters of 'crags' are 'rag'.
The alternating letters of 'those' are 'toe'.
'toe'+'rag'='TOERAG'
'has' is the link.
Can you help me to learn more?
(Other definitions for toerag that I've seen before include "Despicable chap" , "Despicable person (slang)" , "despicable sort" , "Despicable character" , "Squirt" .)
