Person who’s busy with letters on taps, wooden (5)
I believe the answer is:
beech
'person who's busy with letters' is the definition.
I can't tell whether this defines the answer.
'on taps wooden' is the wordplay.
'on' means one lot of letters go next to another.
'taps' becomes 'C H' (cold and hot taps).
'wooden' becomes 'bee' (I can't justify this - if you can you should give a lot more credence to this answer).
'ch' after 'bee' is 'BEECH'.
Can you help me to learn more?
(Other definitions for beech that I've seen before include "Tree variety" , "Tree (with green or copper leaves)" , "Tree with bitter 'nuts'" , "Tree of Fagus genus" , "Nut-bearing tree" .)