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Getting tired. Can someone please help me to finish this off?
4D Sentimental e-message terminated prematurely. (4)
T - E -
38A Electronic device shows movement across south by soldiers. (10) T - A -S - - - - -
33D Sir is unassuming about gold. (6) - I - - - D
39D More reliable piece of cloth to use in first aid (9)
- - P - N - H - R
Thank you very much.

38a TRANSISTOR

33d MILORD

39d STAUNCHER

4 Twee[t]

You are very kind. Now an old man can go to bed happy!

4D is TWEE (tweet)
38A is TRANSISTOR (transit around"S" + OR)
33D is MILORD (mild around "OR")
39D is STAUNCHER (double meaning)