They support members and volunteers with typing complaint? (5)
I believe the answer is:
tarsi
'they support members' is the definition.
(bones in the feet, which support legs)
'volunteers with typing complaint?' is the wordplay.
'volunteers' becomes 'TA' (abbreviation for Territorial Army).
'with' says to put letters next to each other.
'typing complaint?' becomes 'RSI' (repetitive strain injury is often caused by typing).
'ta'+'rsi'='TARSI'
'and' is the link.
(Other definitions for tarsi that I've seen before include "Bones of the ankles and heels" , "collections of bones?" , "parts of leg" , "Parts of skeleton" , "Ankle bones" .)