Pip starts to see Estella every day (4)
I believe the answer is:
seed
'pip' is the definition.
(I've seen this before)
'starts to see estella every day' is the wordplay.
'starts to' suggests taking the first letters.
The first letters of 'see estella every day' is 'SEED'.
(Other definitions for seed that I've seen before include "one of the top players" , "Pip; origin, beginning" , "Germ; top player" , "Beginning; sow (land)" , "favourite player" .)