Recreation for Father's Day (7)

I believe the answer is:

pastime

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'recreation' is the definition.
(I know that pastime is a type of recreation)

'father's day' is the wordplay.
'father's' becomes 'pa's' (pa can mean dad or father).
'day' becomes 'time' (I can't explain this - if you can you should believe this answer much more).
'pas'+'time'='PASTIME'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for pastime that I've seen before include "relaxation" , "doing the crossword, say" , "diversion" , "Hobby - recreation" , "Leisure pursuit" .)

I've seen this clue in The Globe and Mail.

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