times jumbo 814

[tobyw]

Struggling this week.
12a. Heat regularly opens most of cluster of flowers.(7)--s----
7d. Wicked princess overcomes a head of state. (6) starts with r
25a. Sadly perish before urban area achieves fully regular form.(10) ---e-i-ity
44a. Kill second figure in plane- I escaped.(8)
L second last letter.
41d. Officer rose, suppressing one expression of surprise(9) Starts with B
34D. Criminal at first is given 30 days, possessing old rifle(9)
Thanks in advance

[Lie-in King]

12a Oestrus - (regular letters of) 'OpEnS' + 'trus(s)'
7d Reagan - 'Regan' (King Lear) (round) 'a'
25a Sphericity - anag 'perish' + 'city'
44a S-tr(i)angle
41d Brigadier - 'Brier' (rose) (round) 'i (1) Gad'
34d Chassepot - C(riminal) + has + Sept(ember) (round) o(ld)

[tobyw]

Thank you Lie-In-King. I appreciate the explanations. I never heard of a chassepot.
Is 5d hypercube?
Is 33d an anagram of sadly old sung?
Is 43d anagram of castle is?
31d. Bloke I found in efficient library(8) Starts with B
Thanks