Unimportant independent married male sent to the interior with money (10)
I believe the answer is:
immaterial
'unimportant' is the definition.
(I've seen this before)
'independent married male sent to the interior with money' is the wordplay.
I cannot really understand how this works, but
'independent' could be 'i' and 'i' is found in the answer.
'married' could be 'm' (abbreviation, e.g. in genealogy) and 'm' is located in the answer.
'male' could be 'al' (shortened version of Alex or Alistair) and 'al' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'money' could be 'm' (abbreviation used in economics) and 'm' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for immaterial that I've seen before include "unimportant" , "Irrelevant" , "of no importance" .)