Related Clues:

• Dubs in
• Fathers amounts to this
• Finds the sum of
• Does simple arithmetic
• Takes on, as a new Facebook friend
• Connects figures for Dads all over the place
• Totals one's scorecard
• While entertaining reverend gentleman tots will assuredly appear
• Does some sums
• Counts (up)
• Makes new friends?
• Accountant does it to a theologian at school
• Makes sense (with "up")
• Finds sums
• Writes as a postscript, say