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This is my first post, although I've been using the site for ages. Thanks to my limited brainpower and this site I've got down to the last 4:

7d Plant that's very big, one loose falling over inside (6) - I have O-A-I- If the answer is OXALIC, I'd be grateful for an explanation why.
36a Woman regarded as a character in Israel (4) - I have -E-- Is this BETH?
24a Emergence of female monster with new head (6) - I have E-R-S-
37d Using two signals - they're done in special combination (10) - I have --T-R-D-N

Any parsing would be much appreciated.

O XAL I S

Beth is a character in the Hebrew alphabet, so looks good.

Ogress (female monster) with new head - egress - emergence?

Heterodyne -using two signals- anagram of they're done?

Many thanks Ab and Rambler. I can relax now until tomorrow's Times cryptic!