Period in which I would always support father (6)
I believe the answer is:
friday
'period' is the definition.
(Friday is an example)
'i would always support father' is the wordplay.
'i would' becomes 'id'.
'always' becomes 'ay'.
'support' is a charade indicator (letters next to each other) (in a down clue, some letters hold others up).
'father' becomes 'fr'.
'id'+'ay'='iday'
'iday' put after 'fr' is 'FRIDAY'.
'in which' is the link.
(Other definitions for friday that I've seen before include ""Good" day at Easter?" , "If this day is the 13th, it's unlucky" , "Where the weekend starts?" , "faithful companion" , "The 13th is considered unlucky" .)