Dry boards chip and split (6)
I believe the answer is:
bisect
'split' is the definition.
(I've seen this in another clue)
'dry boards chip' is the wordplay.
'dry' becomes 'sec' (similar in meaning).
'boards' means one lot of letters goes inside another.
'chip' becomes 'bit' (synonyms).
'sec' inserted within 'bit' is 'BISECT'.
'and' is the link.
(Other definitions for bisect that I've seen before include "fork" , "Cut twenty [IN TWO]" , "Halve (angle)" , "Divide in half" , "Cut or divide in two" .)