Lovatts colossus 143 Stinker

Hi Puzzlers
Help to finish needed
65a. Tittered. (I have got GIBERED) although I think it should be spelt with two B's which dosen't fit.
82a. Glowing = L?M?E?T
121a SwampySiberian forest =. T???A
278a. Rewrote (Rehashed!!!!!). RE?A???D
46d. Cream root vegetable (I think this should be TURNIP but this dosen't fit. = TUR??IP
98d. Word comparison =. .I???E
142d. Song of praise =. P?E?N
151d. Horse's weight handcap. (IMPOST). Is the correct?
214d. Hand over. =. TE?OVER
260d. Below ( literary). =. N?A??
Cheers
Smithy