Very like the gentleman sorting the mail inside (7)
I believe the answer is:
similar
'very like' is the definition.
'similar' can be an answer for 'like' (I've seen this before). I'm not certain of the 'very' bit.
'the gentleman sorting the mail inside' is the wordplay.
I cannot really see how this works, but
an anagram of 'mail' is 'mila' which is present in the answer.
'gentleman' could be 'sir' (I've seen this before) and 'sir' is found in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for similar that I've seen before include "Having a close resemblance to" , "Comparable" , "Alike, resembling" , "Of the same kind" , "Resembling, like" .)