Crack the cryptic

Are there any clues?

Sorry, Cherrie, like I said, I'm brain dead or have sunstroke at the moment.

17a - Lance Pearson, on being ignored,was upset
32a - dental surgery drill
34a - trophy found with cake on board
35a - clergyman worshipped around mid-morning
44a - account for public announcement
48a - itching to go, Lester moved onto ship
18d - chance to go into Saharan dominion
23d - saying Nat discounted technical developments
27d - valued doctors disappear
29d - give an overview of amount of money armied used
30d - deputy head relieved letters were brought to door
31d - dave tries fixing plug
33d - powerful narration
36d - another rat seen? That's serious!
45d - schedule takes time and preparation
THANKS! in advance for any help you are able to give me, Cherrie

17a = spear
32a = practice
34a = cup
35a = reverend
44a = statement
48a = restless
18d = random
23d = cliché
27d = appraised
29d = summarise
30d = delivered
31d = advertise
33d = telling
36d = earnest
45d = agenda

Good luck

thank you once again, Dutchy