Colour dry clothing with it (4)
I believe the answer is:
tint
'colour' is the definition.
(tint is a kind of colour)
'dry clothing with it' is the wordplay.
'dry' becomes 'tt' (abbreviation for teetotal).
'clothing' indicates putting letters inside.
'with it' becomes 'in' (both can mean trendy**).
'tt' going around 'in' is 'TINT'.
(Other definitions for tint that I've seen before include "(Softer variety of) colour" , "work for coiffeuse?" , "Hue, shade" , "Hair dye" , "'Shade, tone (4)'" .)