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I am stuck on a few final clues on this, so any assistance would be appreciated.

7a Sticky strip (8,4) ???E???ETAPE Scotch tape doesn't fit nor does Sellotape or duct tape.
1d Process of summation (8) ???I?A?N
3d Straightforward (6) ???E?T

Thanks everyone.

Adhesive tape ?
Addition

7-adhesive tape

3 direct

Direct