Times, 4674.

[red46]

15d, 2words, 5.4. G?p?? ????, Insecure pygmy shot six footer.
20a, 8lets, ?o?o???s, They're said to be the same but they don't mean it.
22a, 6lets, ?e?r??, odd fish party spotted behind dam.
26a, 10lets, ??l?o?r?p?, Camp kind of guy following priest in fashionable shade of purple.

[bookbinder]

26a heliotrope

[dannyk13]

15d.Gypsy moth
20a.Homonyms
22a.Weirdo

[Mamyalynne]

Gypsy moth

Homonyms

Weirdo

Heliotrope

[bookbinder]

22a weirdo

[Calibax]

15d Gypsy Moth

[Lie-in King]

15d Gypsy moth - anag 'pygmy shot'
20a Homonyms - words with the same sound but different meanings
22a Weir-do
26a Heliotrope - 'rope' (camp [as tents] kind of guy) (after) ''Eli' (priest, in) 'hot'

[red46]

Thanks everyone for your help, not sure about 17a, is it alphabetical or alphamerical.

[Lie-in King]

Alphabetical

[Mamyalynne]

Alphabetical as in the spelling of - chimps

[red46]

Thank you very much both for your help.