Very experienced in wool dyeing (3)
I believe the answer is:
old
'very experienced' is the definition.
'old' can be an answer for 'experienced' (associated in meaning). I am unsure of the 'very' bit.
'in wool dyeing' is the wordplay.
'in' indicates a hidden word.
'OLD' can be found hidden inside 'wool dyeing'.
Can you help me to learn more?
(Other definitions for old that I've seen before include "out of the ark" , "No longer young" , "Wild clematis" , "Former; aged" , "Long in the tooth" .)