Lobster perhaps beheaded at that time (3)
I believe the answer is:
hen
'lobster' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's a link between them I don't understand?
'beheaded at that time' is the wordplay.
'beheaded' means to remove the first letter (the head of the word is removed).
'at that time' becomes 'then' (at some former time).
'then' with its initial letter taken off is 'HEN'.
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for hen that I've seen before include "Composed of women" , "Female lobster, fowl" , "Female bird" , "Source of eggs" , "Adult female chicken" .)