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Last couple. 52d Sailor beginning to scale a mountain in Thessaly (4)
?S?A

51a Old boys clear about engaging woman doctor (12) ?B?T?T?I?I?N
Presumably it is Obstetrician (OBS for Old Boys, and "woman doctor" as the definition) but cannot see the rest of the parsing

Thanks in anticipation

OSSA

OS - ordinary seaman
starts of Scale A

Best known from expression "pile Pelion on Ossa"

obs old boys
clear net about ten
woman Tricia

51a O - old
BS - b(oy)s

NET - clear (about)

TRICIA - woman

Thanks very much for your replies - all done now