Deals making profits for the landlord? (8)
'deals' is the definition.
('bargain' can be a synonym of 'deal')
'profits for the landlord?' is the wordplay.
'profits' becomes 'gains' ('gain' can be a synonym of 'profit').
'for' means one lot of letters go next to another (I've seen this in other clues).
'the landlord?' becomes 'bar' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'gains' after 'bar' is 'BARGAINS'.
'making' is the link.
Can you help me to learn more?
(Other definitions for bargains that I've seen before include "Advantageous purchases", "Haggles over price", "Special offers", "They're cheap at the price, as in sales", "Goods procured cheaply at sale".)