That clambers, in various senses of vbs.

1

c. 1340.  [see CLAMBER v.1]

2

1685.  H. More, Illustr., 93. The clambring nature of the Goat intimates also the aspiring ambition of Alexander.

3

a. 1718.  Parnell, Gift of Poetry (1758), 146 (R.).

        No clamb’ring mountains make my lover stay,
(For what are mountains, in a lover’s way?)

4

a. 1763.  Shenstone, Wks. (1764), I. 78. View the clamb’ring goats ascend.

5

1883.  Grant Allen, in Knowledge, 31 Aug., 129/1. The leaflets at the end of the stalk in the most clambering species of peaflowers have been gradually metamorphosed into twining tendrils.

6