Cryptic

[Barbray]

1. Edward is alternatively seen as mothers partner
???

2. Towards the summit with difficulty
?p?I??

3. 150 English men see why we need mercy
?????n?y

4.. Deed i changed for little Edward who sounds as if hes whirling
E????

5. The sort of mentality you develop when your fortress us surrounded and your supplies are cut off any wonder
?I?g?

Cheers and stay safe

[Spicerack]

!. Dad

[Spicerack]

2. uphill

[Spicerack]

3. clemency

[Spicerack]

4. Eddie

[Spicerack]

5. siege.

[fiction-factory]

Agreed. Just some examples of how they're arrived at, to help if you have any more.

1 comes from Edward alternate letters
4 Anagram of DEED I and sounds like an 'eddy' (whirlpool)
3 CL (150) +E (English) +MEN +CY (I assume it's because the CY sounds like 'see why' in the clue but there is no 'sounds like' indicator.