Aquatic mammal seen in play regularly — big draw? (7)
I believe the answer is:
lottery
'big draw?' is the definition.
'lottery' can be an answer for 'draw?' (I've seen this before). I am not sure about the 'big' bit.
'aquatic mammal seen in play regularly' is the wordplay.
'aquatic mammal' becomes 'otter' (otters live by water).
'seen in' indicates putting letters inside.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'play' are 'ly'.
'otter' put within 'ly' is 'LOTTERY'.
Can you help me to learn more?
(Other definitions for lottery that I've seen before include "The random drawing of numbers from a drum" , "try his luck here" , "Chance process" , "chancy business" , "Sweepstake" .)