Block of cells where darling joins groom (9)
I believe the answer is:
honeycomb
'block of cells' is the definition.
'honeycomb' can be an answer for 'cells' (I have seen 'Cells of workers' mean 'honeycomb' so perhaps 'cells' could also mean 'honeycomb'). I'm unsure of the 'block of' bit.
'darling joins groom' is the wordplay.
'darling' becomes 'honey' (I've seen this before).
'joins' means one lot of letters go next to another.
'groom' becomes 'comb' (combing is a way of grooming oneself).
'honey'+'comb'='HONEYCOMB'
'where' is the link.
Can you help me to learn more?
(Other definitions for honeycomb that I've seen before include "Bees' wax structure for holding eggs and honey" , "labyrinth" , "cellular network" , "Hive storage structure" , "source of sweetness" .)