Humility in dirty place, after a fashion (7)
I believe the answer is:
modesty
'humility' is the definition.
(I've seen this before)
'dirty place after a fashion' is the wordplay.
'dirty place' becomes 'sty' (I've seen this in another clue).
'after' says to put letters next to each other.
'a fashion' becomes 'mode' (synonyms).
'sty' put after 'mode' is 'MODESTY'.
'in' acts as a link.
(Other definitions for modesty that I've seen before include "Unassuming quality" , "Unassuming character" , "Freedom from vanity" , "Diffidence" , "Decorum, shyness" .)