Maybe sperm whales eat veg regularly (6)
I believe the answer is:
gamete
'maybe sperm' is the definition.
(I know that sperm cell is a type of gamete)
'whales eat veg regularly' is the wordplay.
'whales' becomes 'gam' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'eat'+'veg'='eatveg'
The alternating letters of 'eatveg' are 'ete'.
'gam'+'ete'='GAMETE'
Can you help me to learn more?
(Other definitions for gamete that I've seen before include "Egg- or sperm-cell" , "Reproductive unit" , "An egg or sperm cell" , "Egg-cell" , "Cell which unites with another in reproduction to form a zygote" .)